[alsa-devel] [PATCH] ASoC: Intel: board: add BE DAI link for WoV

[mac.chiang at intel.com]

From: Mac Chiang <mac.chiang at intel.com>

create dai link in kbl_da7219_max98357a driver for wake on voice functionality.

changes picked from broonie's tree
commit 0c7941a63a0f ("ASoC: Intel: Skylake: Use refcap device for mono recording")
commit 2154be362c90 ("ASoc: Intel: boards: Add WOV as sink for nau88l25_ssm4567 machine")

Signed-off-by: Mac Chiang <mac.chiang at intel.com>
---
 sound/soc/intel/boards/kbl_da7219_max98357a.c | 35 +++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/sound/soc/intel/boards/kbl_da7219_max98357a.c b/sound/soc/intel/boards/kbl_da7219_max98357a.c
index e84baaf..c332a32 100644
--- a/sound/soc/intel/boards/kbl_da7219_max98357a.c
+++ b/sound/soc/intel/boards/kbl_da7219_max98357a.c
@@ -45,6 +45,7 @@ struct kbl_codec_private {
 enum {
 	KBL_DPCM_AUDIO_PB = 0,
 	KBL_DPCM_AUDIO_CP,
+	KBL_DPCM_AUDIO_REF_CP,
 	KBL_DPCM_AUDIO_DMIC_CP,
 	KBL_DPCM_AUDIO_HDMI1_PB,
 	KBL_DPCM_AUDIO_HDMI2_PB,
@@ -349,6 +350,27 @@ static const unsigned int ch_mono[] = {
 	1,
 };
 
+static const struct snd_pcm_hw_constraint_list constraints_refcap = {
+	.count = ARRAY_SIZE(ch_mono),
+	.list  = ch_mono,
+};
+
+static int kabylake_refcap_startup(struct snd_pcm_substream *substream)
+{
+	substream->runtime->hw.channels_max = 1;
+	snd_pcm_hw_constraint_list(substream->runtime, 0,
+					SNDRV_PCM_HW_PARAM_CHANNELS,
+					&constraints_refcap);
+
+	return snd_pcm_hw_constraint_list(substream->runtime, 0,
+				SNDRV_PCM_HW_PARAM_RATE,
+				&constraints_16000);
+}
+
+static struct snd_soc_ops skylaye_refcap_ops = {
+	.startup = kabylake_refcap_startup,
+};
+
 /* kabylake digital audio interface glue - connects codec <--> CPU */
 static struct snd_soc_dai_link kabylake_dais[] = {
 	/* Front End DAI links */
@@ -380,6 +402,19 @@ static struct snd_soc_dai_link kabylake_dais[] = {
 			SND_SOC_DPCM_TRIGGER_POST, SND_SOC_DPCM_TRIGGER_POST},
 		.dpcm_capture = 1,
 	},
+	[KBL_DPCM_AUDIO_REF_CP] = {
+		.name = "Kbl Audio Reference cap",
+		.stream_name = "Wake on Voice",
+		.cpu_dai_name = "Reference Pin",
+		.codec_name = "snd-soc-dummy",
+		.codec_dai_name = "snd-soc-dummy-dai",
+		.platform_name = "0000:00:1f.3",
+		.init = NULL,
+		.dpcm_capture = 1,
+		.nonatomic = 1,
+		.dynamic = 1,
+		.ops = &skylaye_refcap_ops,
+	},
 	[KBL_DPCM_AUDIO_DMIC_CP] = {
 		.name = "Kbl Audio DMIC cap",
 		.stream_name = "dmiccap",
-- 
2.7.4